Not Ranked
Hey,
I am sure others will have more info for you but as a reference point I am running a steel 5/16" without issue. The fuel lines are #6 AN to and from the main steel line run along the frame rail.
This is feeding a 540 inch Chebbie engine and not a Contemporary but 5/16 is at least enough for your 482 " engine and I think 1/4 would be fine. I prefer the advantages of an electric pump but admit a quality mechanical pump is pretty reliable. Have fun,enjoy your Toy.
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